I have noiticed big losses in SERPS for major KW for one of my sites. It is strange as a few KW are now not ranked at all. Webmaster tools shows no problems, still indexed etc My homepage still ranks when you do search of domain name top. I have been reading elsewhere that there seems as if there have been some serious changes made and is being referred to as halloween update., or at least am hoping they have and results will return. However, this happened to my site on 29th Oct For eg one KW was top page, now my site only ranks for this KW on an internal page of my site at about page 5. Home page is nowhere to be seen. Done some checks this morning and some KWs seem to be returning, but the main one is still disappeared. Has anyone else seen this happpening? Any explanations or theories? Is it time to sit tight or panic??